The light brown label is on the top inside of the front. Says 'This 1986 issue of the Complete Keynote Collection is a Limited Edition. Your Copy No........ Signed by Kiyoshi Koyama'.
That said, I have seen other copies of the set without signed label, otherwise box is identical. Some of the sets have the blue and white disk ('Untitled Blues' - maybe not strictly an EP but I think of it as such), others I have seen seem to be missing it. Suspect that all sets originally had the extra disk when purchased.
The extra disk format also seems to have been used with the Mercury VSOP set that was also issued around this time.
As mentioned though, it is the quality of the music that counts and this is unbeatable. Bottom line is that for your $200 - $300 you are getting fantastic bang-per-buck music wise. $100 from Amoeba is an incredible deal !